<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vue.js"></script>
    <style>
        .active{
            color: red;
        }
    </style>
</head>
<body>
    <div id="app">
        <button @click="cname = 'one' " :class="{ active: cname == 'one' }" >one</button>
        <button @click="cname = 'two' " :class="{ active: cname == 'two' }">two</button>
        <button @click="cname = 'three' " :class="{ active: cname == 'three' }">three</button>
        <div>
            <!-- <one></one> -->
            <keep-alive>
                 <component :is="cname"></component>
            </keep-alive>
           
        </div>
     
    
    </div>
    <script>
        Vue.component("one",{
            template:`
                <div>
                   one 的内容 {{ username }}
                </div>
            `,
            data(){
                return{
                    username:""
                }
            },
            created(){
                fetch("./1.json")
                .then(res=>res.json())
                .then(res=>{
                    console.log(res);
                    this.username =res.name
                })
            }
        })

        Vue.component("two",{
            template:`
                <div>
                   two 组件内容
                </div>
            `,
        })

        Vue.component("three",{
            template:`
                <div>
                   three 组件
                </div>
            `,
        })

        new Vue({
            el:"#app",
            data(){
                return {
                    cname:"one"
                }
            }
           
            
        })

    </script>
</body>
</html>